Use ansible_service_mgr fact

This patch removes some extra tasks for detecting systemd and uses
the  fact instead.

Partial-Bug: #1640125
Change-Id: I213b38b166de724990958a316e577478d7e4823c

tasks/main.yml

@@ -24,19 +24,6 @@
   tags:
     - always
 
-- name: Check init system
-  command: cat /proc/1/comm
-  changed_when: false
-  register: _pid1_name
-  tags:
-    - always
-
-- name: Set the name of pid1
-  set_fact:
-    pid1_name: "{{ _pid1_name.stdout }}"
-  tags:
-    - always
-
 - include: repo_pre_install.yml
 - include: repo_install.yml
 - include: repo_post_install.yml

tasks/repo_post_install.yml

@@ -151,7 +151,7 @@
     owner: "root"
     group: "root"
   when:
-    - pid1_name == "init"
+    - ansible_service_mgr == 'upstart'
     - ansible_distribution == "Ubuntu"
   notify:
     - Init reload
@@ -170,7 +170,7 @@
     - { src: "git.service.j2", dest: "/lib/systemd/system/git@.service" }
     - { src: "git.socket.j2", dest: "/lib/systemd/system/git.socket" }
   when:
-    - pid1_name == "systemd"
+    - ansible_service_mgr == 'systemd'
   notify:
     - reload git socket
   tags: